LINER LT1498CN8

LT1498/LT1499
10MHz, 6V/µs, Dual/Quad
Rail-to-Rail Input and Output
Precision C-Load Op Amps
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DESCRIPTION
FEATURES
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The LT ®1498/LT1499 are dual/quad, rail-to-rail input and
output precision C-LoadTM op amps with a 10MHz gainbandwidth product and a 6V/µs slew rate.
Rail-to-Rail Input and Output
475µV Max VOS from V + to V –
Gain-Bandwidth Product: 10MHz
Slew Rate: 6V/µs
Low Supply Current per Amplifier: 1.7mA
Input Offset Current: 50nA Max
Input Bias Current: 500nA Max
Open-Loop Gain: 1000V/mV Min
Low Input Noise Voltage: 12nV/√Hz Typ
Wide Supply Range: 2.2V to ±15V
Large Output Drive Current: 30mA
Stable for Capacitive Loads Up to 10,000pF
Dual in 8-Pin PDIP and SO Package
Quad in Narrow 14-Pin SO
The LT1498/LT1499 are designed to maximize input
dynamic range by delivering precision performance over
the full supply voltage. Using a patented technique, both
input stages of the LT1498/LT1499 are trimmed, one at the
negative supply and the other at the positive supply. The
resulting guaranteed common mode rejection is much
better than other rail-to-rail input op amps. When used as a
unity-gain buffer in front of single supply 12-bit A-to-D
converters, the LT1498/LT1499 are guaranteed to add less
than 1LSB of error even in single 3V supply systems.
With 110dB of supply rejection, the LT1498/LT1499 maintain their performance over a supply range of 2.2V to 36V
and are specified for 3V, 5V and ±15V supplies. The inputs
can be driven beyond the supplies without damage or
phase reversal of the output. These op amps remain stable
while driving capacitive loads up to 10,000pF.
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APPLICATIONS
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Driving A-to-D Converters
Active Filters
Rail-to-Rail Buffer Amplifiers
Low Voltage Signal Processing
Battery-Powered Systems
The LT1498 is available with the standard dual op amp
configuration in 8-pin PDIP and SO packaging. The LT1499
features the standard quad op amp configuration and is
available in a 14-pin plastic SO package. These devices can
be used as plug-in replacements for many standard op
amps to improve input/output range and precision.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
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Frequency Response
TYPICAL APPLICATION
10
VIN = 2.7VP-P
V + = 3V
0
Single Supply 100kHz 4th Order Butterworth Filter
–10
– 20
– 30
6.81k
11.3k
VIN
100pF
5.23k
–
10.2k
1/2 LT1498
+
47pF
V+
5.23k
330pF
GAIN (dB)
6.81k
1000pF
–
1/2 LT1498
+
– 40
– 50
– 60
–70
VOUT
– 80
– 90
–100
V +/2
1498 TA01
–110
100
1k
100k
10k
FREQUENCY (Hz)
1M
10M
1498 TA02
1
LT1498/LT1499
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ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V –) ............................. 36V
Input Current ..................................................... ±10mA
Output Short-Circuit Duration (Note 1) ........ Continuous
Operating Temperature Range ............... – 40°C to 85°C
Specified Temperature Range (Note 3) .... – 40°C to 85°C
Junction Temperature .......................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
OUT A 1
– IN A 2
8
A
+ IN A 3
V– 4
N8 PACKAGE
8-LEAD PDIP
B
V+
7
OUT B
6
– IN B
5
+ IN B
S8 PACKAGE
8-LEAD PLASTIC SO
LT1498CN8
LT1498CS8
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1498
14 OUT D
OUTA 1
– IN A 2
+ IN A 3
A
D
V+ 4
+ IN B 5
S8 PART MARKING
ORDER PART
NUMBER
TOP VIEW
13 – IN D
LT1499CS
12 + IN D
11 V –
B
C
10 + IN C
– IN B 6
9
– IN C
OUT B 7
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Military and Industrial grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V,0V; VS = 3V,0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V +
VCM = V –
MIN
150
150
475
475
µV
µV
∆VOS
Input Offset Voltage Shift
VCM = V – to V +
150
425
µV
200
750
µV
250
– 250
500
0
nA
nA
500
1000
nA
10
– 10
100
0
nA
nA
Input Offset Voltage Match (Channel-to-Channel) VCM = V +, V – (Note 4)
V+
IB
Input Bias Current
VCM =
VCM = V –
∆IB
Input Bias Current Shift
VCM = V – to V +
V + (Note 4)
0
– 500
Input Bias Current Match (Channel-to-Channel)
VCM =
VCM = V – (Note 4)
0
– 100
IOS
Input Offset Current
VCM = V +
VCM = V –
5
5
50
50
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – to V +
10
100
nA
Input Noise Voltage
0.1Hz to 10Hz
400
nVP-P
en
Input Noise Voltage Density
f = 1kHz
12
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.3
pA/√Hz
CIN
Input Capacitance
AVOL
Large-Signal Voltage Gain
2
5
VS = 5V, VO = 75mV to 4.8V, RL = 10k
VS = 3V, VO = 75mV to 2.8V, RL = 10k
600
500
3800
2000
pF
V/mV
V/mV
LT1498/LT1499
ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = 5V,0V; VS = 3V,0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V – to V +
VS = 3V, VCM = V – to V +
81
76
90
86
dB
dB
CMRR Match (Channel-to-Channel) (Note 4)
VS = 5V, VCM = V – to V +
VS = 3V, VCM = V – to V +
75
70
91
86
dB
dB
Power Supply Rejection Ratio
VS = 2.2V to 12V, VCM = VO = 0.5V
88
105
dB
PSRR Match (Channel-to-Channel) (Note 4)
VS = 2.2V to 12V, VCM = VO = 0.5V
82
103
dB
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 2.5mA
14
35
90
30
70
200
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISOURCE = 0.5mA
ISOURCE = 2.5mA
2.5
50
140
10
100
250
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
IS
Supply Current per Amplifier
GBW
Gain-Bandwidth Product (Note 6)
SR
Slew Rate (Note 7)
PSRR
±12.5
±12.0
±24
±19
1.7
VS = 5V, AV = – 1, RL = Open, VO = 4V
VS = 3V, AV = – 1, RL = Open
MAX
UNITS
mA
mA
2.2
mA
6.8
10.5
MHz
2.6
2.3
4.5
4.0
V/µs
V/µs
MIN
0°C < TA < 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V +
VCM = V – + 0.1V
●
●
175
175
650
650
µV
µV
VOS TC
Input Offset Voltage Drift (Note 2)
VCM = V +
●
●
0.5
1.5
2.5
4.0
µV/°C
µV/°C
∆VOS
Input Offset Voltage Shift
VCM = V – + 0.1V to V +
●
170
600
µV
200
900
µV
275
– 275
600
0
nA
nA
550
1200
nA
15
– 15
170
0
nA
nA
Input Offset Voltage Match (Channel-to-Channel) VCM =
V – + 0.1V, V + (Note 4)
●
IB
Input Bias Current
VCM = V +
VCM = V – + 0.1V
●
●
∆IB
Input Bias Current Shift
VCM = V – + 0.1V to V +
●
V + (Note 4)
0
– 600
Input Bias Current Match (Channel-to-Channel)
VCM =
VCM = V – + 0.1V (Note 4)
●
●
IOS
Input Offset Current
VCM = V +
VCM = V – + 0.1V
●
●
10
10
85
85
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.1V to V +
●
20
170
nA
AVOL
Large-Signal Voltage Gain
VS = 5V, VO = 75mV to 4.8V, RL = 10k
VS = 3V, VO = 75mV to 2.8V, RL = 10k
●
●
500
400
2500
2000
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V – + 0.1V to V +
VS = 3V, VCM = V – + 0.1V to V +
●
●
78
73
89
85
dB
dB
CMRR Match (Channel-to-Channel) (Note 4)
VS = 5V, VCM = V – + 0.1V to V +
VS = 3V, VCM = V – + 0.1V to V +
●
●
74
69
90
86
dB
dB
Power Supply Rejection Ratio
VS = 2.3V to 12V, VCM = VO = 0.5V
●
86
102
dB
PSRR Match (Channel-to-Channel) (Note 4)
VS = 2.3V to 12V, VCM = VO = 0.5V
●
80
102
dB
PSRR
0
– 170
V/mV
V/mV
3
LT1498/LT1499
ELECTRICAL CHARACTERISTICS
0°C < TA < 70°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 2.5mA
●
●
●
17
40
110
35
80
220
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISOURCE = 0.5mA
ISOURCE = 2.5mA
●
●
●
3.5
55
160
15
120
300
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3V
●
●
IS
Supply Current per Amplifier
●
GBW
Gain-Bandwidth Product (Note 6)
●
6.1
9
MHz
SR
Slew Rate (Note 7)
●
●
2.5
2.2
4.0
3.5
V/µs
V/µs
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
MIN
±12
±10
± 23
±20
1.9
mA
mA
2.6
mA
– 40°C < TA < 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
VOS
Input Offset Voltage
VOS TC
Input Offset Voltage Drift (Note 2)
∆VOS
Input Offset Voltage Shift
CONDITIONS
TYP
MAX
UNITS
●
●
250
250
750
750
µV
µV
VCM = V +
●
●
0.5
1.5
2.5
4.0
µV/°C
µV/°C
VCM = V – + 0.1V to V +
●
250
650
µV
300
1500
µV
350
– 350
750
0
nA
nA
700
1500
nA
30
– 30
180
0
nA
nA
VCM =
VCM =
Input Offset Voltage Match (Channel-to-Channel) VCM =
V+
V – + 0.1V
V – + 0.1V, V + (Note 4)
MIN
●
IB
Input Bias Current
VCM = V +
VCM = V – + 0.1V
●
●
∆IB
Input Bias Current Shift
VCM = V – + 0.1V to V +
●
Input Bias Current Match (Channel-to-Channel)
VCM = V + (Note 4)
VCM = V – + 0.1V (Note 4)
●
●
IOS
Input Offset Current
VCM = V +
VCM = V – + 0.1V
●
●
15
15
90
90
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.1V to V +
●
30
180
nA
AVOL
Large-Signal Voltage Gain
VS = 5V, VO = 75mV to 4.8V, RL = 10k
VS = 3V, VO = 75mV to 2.8V, RL = 10k
●
●
400
300
2500
2000
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = V – + 0.1V to V +
VS = 3V, VCM = V – + 0.1V to V +
●
●
77
73
86
81
dB
dB
CMRR Match (Channel-to-Channel) (Note 4)
VS = 5V, VCM = V – + 0.1V to V +
VS = 3V, VCM = V – + 0.1V to V +
●
●
72
69
86
83
dB
dB
Power Supply Rejection Ratio
VS = 2.5V to 12V, VCM = VO = 0.5V
●
86
100
dB
80
100
PSRR
0
– 750
0
– 180
V/mV
V/mV
PSRR Match (Channel-to-Channel) (Note 4)
VS = 2.5V to 12V, VCM = VO = 0.5V
●
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 2.5mA
●
●
●
18
45
110
40
80
220
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISOURCE = 0.5mA
ISOURCE = 2.5mA
●
●
●
3.5
60
170
15
120
300
mV
mV
mV
4
dB
LT1498/LT1499
ELECTRICAL CHARACTERISTICS
– 40°C < TA < 85°C, VS = 5V, 0V; VS = 3V, 0V; VCM = VOUT = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
ISC
Short-Circuit Current
VS = 5V
VS = 3V
IS
Supply Current per Amplifier
GBW
Gain-Bandwidth Product (Note 6)
SR
Slew Rate (Note 7)
●
●
MIN
TYP
±7.5
±7.5
±15
±15
2.0
●
VS = 5V, AV = –1, RL = Open, VO = 4V
VS = 3V, AV = –1, RL = Open
MAX
UNITS
mA
mA
2.7
mA
●
5.8
8.5
MHz
●
●
2.2
1.9
3.6
3.2
V/µs
V/µs
MIN
TYP
MAX
UNITS
200
200
800
800
µV
µV
150
650
µV
250
1400
µV
250
– 250
550
0
nA
nA
500
1100
nA
12
– 12
120
0
nA
nA
TA = 25°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
V+
VOS
Input Offset Voltage
VCM =
VCM = V –
∆VOS
Input Offset Voltage Shift
VCM = V – to V +
Input Offset Voltage Match (Channel-to-Channel) VCM =
V +,
V – (Note 4)
IB
Input Bias Current
VCM = V +
VCM = V –
∆IB
Input Bias Current Shift
VCM = V – to V +
V + (Note 4)
0
– 550
Input Bias Current Match (Channel-to-Channel)
VCM =
VCM = V – (Note 4)
0
– 120
IOS
Input Offset Current
VCM = V +
VCM = V –
6
6
60
60
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – to V +
12
120
nA
Input Noise Voltage
0.1Hz to 10Hz
400
en
Input Noise Voltage Density
f = 1kHz
12
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.3
pA/√Hz
AVOL
Large-Signal Voltage Gain
VO = – 14.5V to 14.5V, RL = 10k
VO = – 10V to 10V, RL = 2k
1000
500
5200
2300
V/mV
V/mV
Channel Separation
VO = – 10V to 10V, RL = 2k
nVP-P
116
130
dB
VCM =
V – to V +
93
106
dB
CMRR Match (Channel-to-Channel) (Note 4)
VCM =
V – to V +
87
103
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
89
110
dB
PSRR Match (Channel-to-Channel) (Note 4)
VS = ±5V to ±15V
83
105
dB
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 10mA
18
40
230
30
80
500
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 10mA
2.5
55
420
10
120
800
mV
mV
mV
ISC
Short-Circuit Current
CMRR
PSRR
Common-Mode Rejection Ratio
IS
Supply Current per Amplifier
GBW
Gain-Bandwidth Product (Note 6)
SR
Slew Rate
±15
±30
6.8
10.5
MHz
3.5
6
V/µs
1.8
AV = – 1, RL = Open, VO = ±10V
Measure at VO = ±5V
mA
2.5
mA
5
LT1498/LT1499
ELECTRICAL CHARACTERISTICS
0°C < TA < 70°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V +
VCM = V – + 0.1V
●
●
200
200
900
900
µV
µV
VOS TC
Input Offset Voltage Drift (Note 2)
VCM = V +
●
●
1.0
2.0
3.5
5.0
µV/°C
µV/°C
∆VOS
Input Offset Voltage Shift
VCM = V – + 0.1V to V +
●
200
750
µV
350
1500
µV
300
– 300
675
0
nA
nA
600
1350
nA
20
– 20
180
0
nA
nA
Input Offset Voltage Match (Channel-to-Channel) VCM =
V – + 0.1V, V + (Note 4)
MIN
●
IB
Input Bias Current
VCM = V +
VCM = V – + 0.1V
●
●
∆IB
Input Bias Current Shift
VCM = V – + 0.1V to V +
●
V + (Note 4)
0
– 675
Input Bias Current Match (Channel-to-Channel)
VCM =
VCM = V – + 0.1V (Note 4)
●
●
0
– 180
IOS
Input Offset Current
VCM = V +
VCM = V – + 0.1V
●
●
15
15
90
90
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.1V to V +
●
30
180
nA
AVOL
Large-Signal Voltage Gain
VO = – 14.5V to 14.5V, RL = 10k
VO = – 10V to 10V, RL = 2k
●
●
900
400
5000
2000
V/mV
V/mV
Channel Separation
VO = – 10V to 10V, RL = 2k
●
112
125
dB
VCM =
V – + 0.1V to V +
●
92
103
dB
CMRR Match (Channel-to-Channel) (Note 4)
VCM =
V – + 0.1V to V +
●
86
103
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
●
88
103
dB
PSRR Match (Channel-to-Channel) (Note 4)
VS = ±5V to ±15V
●
82
103
dB
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 10mA
●
●
●
18
45
270
40
90
520
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISOURCE = 0.5mA
ISOURCE = 10mA
●
●
●
3.5
60
480
15
120
1000
mV
mV
mV
ISC
Short-Circuit Current
●
IS
Supply Current per Amplifier
●
GBW
Gain-Bandwidth Product (Note 6)
●
6.1
9
MHz
SR
Slew Rate
●
3.4
5.3
V/µs
CMRR
PSRR
6
Common Mode Rejection Ratio
AV = – 1, RL = Open, VO = ±10V
Measured at VO = ±5V
±12
±28
1.9
mA
2.8
mA
LT1498/LT1499
ELECTRICAL CHARACTERISTICS
– 40°C < TA < 85°C, VS = ±15V, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = V +
VCM = V – + 0.1V
●
●
300
300
950
950
µV
µV
VOS TC
Input Offset Voltage Drift (Note 2)
VCM = V +
●
●
1.0
2.0
3.5
5.0
µV/°C
µV/°C
∆VOS
Input Offset Voltage Shift
VCM = V – + 0.1V to V +
●
250
850
µV
350
1800
µV
350
– 350
800
0
nA
nA
700
1600
nA
20
– 20
200
0
nA
nA
Input Offset Voltage Match (Channel-to-Channel) VCM =
MIN
V – + 0.1V, V + (Note 4)
●
IB
Input Bias Current
VCM = V +
VCM = V – + 0.1V
●
●
∆IB
Input Bias Current Shift
VCM = V – + 0.1V to V +
●
V + (Note 4)
0
– 800
Input Bias Current Match (Channel-to-Channel)
VCM =
VCM = V – + 0.1V (Note 4)
●
●
0
– 200
IOS
Input Offset Current
VCM = V +
VCM = V – + 0.1V
●
●
15
15
100
100
nA
nA
∆IOS
Input Offset Current Shift
VCM = V – + 0.1V to V +
●
30
200
nA
AVOL
Large-Signal Voltage Gain
VO = – 14.5V to 14.5V, RL = 10k
VO = – 10V to 10V, RL = 2k
●
●
800
350
5000
2000
V/mV
V/mV
Channel Separation
VO = – 10V to 10V, RL = 2k
●
110
120
dB
VCM =
V – + 0.1V to V +
●
90
101
dB
CMRR Match (Channel-to-Channel) (Note 4)
VCM =
V – + 0.1V to V +
●
86
100
dB
Power Supply Rejection Ratio
VS = ±5V to ±15V
●
88
100
dB
PSRR Match (Channel-to-Channel) (Note 4)
VS = ±5V to ±15V
●
82
100
dB
VOL
Output Voltage Swing (Low) (Note 5)
No Load
ISINK = 0.5mA
ISINK = 10mA
●
●
●
25
50
275
50
100
520
mV
mV
mV
VOH
Output Voltage Swing (High) (Note 5)
No Load
ISOURCE = 0.5mA
ISOURCE = 10mA
●
●
●
3.5
65
500
15
120
1000
mV
mV
mV
ISC
Short-Circuit Current
●
IS
Supply Current per Amplifier
●
GBW
Gain-Bandwidth Product (Note 6)
●
5.8
8.5
MHz
SR
Slew Rate
●
3
4.75
V/µs
CMRR
PSRR
Common Mode Rejection Ratio
AV = – 1, RL = Open, VO = ±10V,
Measure at VO = ±5V
The ● denotes specifications that apply over the full operating temperature
range.
Note 1: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 2: This parameter is not 100% tested.
Note 3: The LT1498/LT1499 are designed, characterized and expected to
meet these extended temperature limits, but are not tested at – 40°C and
85°C. Guaranteed I grade parts are available, consult factory.
±10
±18
2.0
mA
3.0
mA
Note 4: Matching parameters are the difference between amplifiers A and
D and between B and C on the LT1499; between the two amplifiers on the
LT1498.
Note 5: Output voltage swings are measured between the output and
power supply rails.
Note 6: VS = 3V, VS = ±15V GBW limit guaranteed by correlation to
5V tests.
Note 7: VS = 3V, VS = 5V slew rate limit guaranteed by correlation to
±15V tests.
7
LT1498/LT1499
U W
TYPICAL PERFORMANCE CHARACTERISTICS
VOS Distribution, VCM = 0V
(PNP Stage)
VOS Distribution VCM = 5V
(NPN Stage)
PERCENT OF UNITS (%)
15
10
LT1498: N8, S8 PACKAGES
LT1499: S14 PACKAGE
VS = 5V, 0V
VCM = 5V
15
10
5
5
0
– 500
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
Supply Current vs Supply Voltage
SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
TA = 25°C
1.5
TA = – 55°C
1.0
0.5
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
400
1.0
0.5
0
–100
TA = 125°C
TA = 25°C
– 300
0
50
75
25
TEMPERATURE (°C)
100
– 400
–2
125
–1
TA = – 55°C
0
2
3
4
5
1
COMMON MODE VOLTAGE (V)
1498/99 G05
6
1498/99 G06
Output Saturation Voltage
vs Load Current (Output High)
Output Saturation Voltage
vs Load Current (Output Low)
1000
1000
NPN ACTIVE
100
VS = 5V, 0V
VCM = 5V
0
–100
PNP ACTIVE
VS = ±15V
VCM = – 15V
100
10
TA = – 55°C
1498/99 G07
100
TA = 25°C
TA = 125°C
10
TA = – 55°C
TA = 125°C
VS = 5V, 0V
VCM = 0V
– 400
– 50 – 35 – 20 – 5 10 25 40 55 70 85 100
TEMPERATURE (°C)
SATURATION VOLTAGE (mV)
200
SATURATION VOLTAGE (mV)
INPUT BIAS CURRENT (nA)
100
VS = ±15V
VCM = 15V
300
– 300
200
– 200
1498/99 G04
– 200
VS = 5V, 0V
300
VS = 5V, 0V
1.5
Input Bias Current vs Temperature
500
Input Bias Current
vs Common Mode Voltage
VS = ±15V
0
– 50 –25
36
400
–300
100
300
–100
INPUT OFFSET VOLTAGE (µV)
1498/99 G02
2.0
TA = 125°C
8
0
– 500
500
Supply Current vs Temperature
2.0
4
10
1498/99 G02
1498/99 G01
0
15
5
0
– 500
500
LT1498: N8, S8 PACKAGES
LT1499: S14 PACKAGE
VS = 5V, 0V
VCM = 0V TO 5V
20
INPUT BIAS CURRENT (nA)
PERCENT OF UNITS (%)
20
25
PERCENT OF UNITS (%)
LT1498: N8, S8 PACKAGES
LT1499: S14 PACKAGE
VS = 5V, 0V
VCM = 0V
20
0
∆VOS Shift for VCM = 0V to 5V
25
25
TA = 25°C
1
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
1498/99 G08
1
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
1498/99 G09
LT1498/LT1499
U W
TYPICAL PERFORMANCE CHARACTERISTICS
0.1Hz to 10Hz
Output Voltage Noise
Minimum Supply Voltage
Noise Voltage Spectrum
200
VS = ± 2.5V
VCM = 0V
250
150
100
TA = 85°C
50
TA = 25°C
TA = 70°C
NONFUNCTIONAL
TA = – 55°C
NOISE VOLTAGE (nV/√Hz)
200
140
120
VCM = 2.5V
PNP ACTIVE
100
80
VCM = 4V
NPN ACTIVE
60
40
20
4
2
3
TOTAL SUPPLY VOLTAGE (V)
5
0
40
VOLTAGE GAIN (dB)
7
5
4
VCM = 4V
NPN ACTIVE
2
VCM = 2.5V
PNP ACTIVE
1
10
100
FREQUENCY (Hz)
0
GAIN
10
– 36
– 72
0
–10
–108
– 20
–144
0.1
–180
100
1
10
FREQUENCY (MHz)
VS = ± 2.5V
POSITIVE SUPPLY
50
NEGATIVE SUPPLY
30
20
10
VS = ±15V
70
VS = ± 2.5V
60
50
40
30
20
20
100
18
90
– 60
16
80
– 70
14
70
PHASE MARGIN
12
60
10
50
GAIN BANDWIDTH
8
40
6
30
20
2
10
– 10
0
100
1000
FREQUENCY (kHz)
10000
1498/99 G16
10
1
100
1000
FREQUENCY (kHz)
0
5
10000
Channel Separation vs Frequency
4
10
80
– 50
0
1
90
1498/99 G15
25
15
20
10
TOTAL SUPPLY VOLTAGE (V)
0
30
1498/99 G17
PHASE MARGIN (DEG)
60
GAIN BANDWIDTH (MHz)
70
40
100
Gain Bandwidth and Phase
Margin vs Supply Voltage
PSRR vs Frequency
80
110
1498/99 G14
1498/99 G13
90
108
36
20
– 30
0.01
1000
144
72
PHASE
30
120
PHASE SHIFT (DEG)
50
0
RL = 10k
VS = ±1.5V
VS = ±15V
60
8
1
CMRR vs Frequency
180
COMMON MODE REJECTION RATIO (dB)
VS = 5V, 0V
3
1498/99 G12
Gain and Phase vs Frequency
70
6
1000
1498/99 G11
Noise Current Spectrum
9
10
100
FREQUENCY (Hz)
TIME (1s/DIV)
1498/99 G10
10
1
10
CHANNEL SEPARATION (dB)
1
CURRENT NOISE (pA/√Hz)
160
0
0
POWER SUPPLY REJECTION RATIO (dB)
VS = 5V, 0V
180
OUTPUT VOLTAGE (200nV/DIV)
CHANGE IN OFFSET VOLTAGE (µV)
300
VS = ±15V
VOUT = ±1VP-P
RL = 2k
– 80
– 90
–100
–110
–120
–130
–140
–150
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
1498/99 G18
9
LT1498/LT1499
U W
TYPICAL PERFORMANCE CHARACTERISTICS
60
VOUT = 80% OF VS
AV = –1
8
SLEW RATE (V/µs)
50
OVERSHOOT (%)
10
9
VS = 5V, 0V
AV = 1
RL = 1k
40
30
20
NONINVERTING
6
RISING EDGE
7
6
FALLING EDGE
5
2
0
–2
–4
INVERTING
NONINVERTING
–8
0
10
100
1000
10000
CAPACITIVE LOAD (pF)
–10
3
100000
0
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
4
1498/99 G19
VS = ±15V
Warm-Up Drift vs Time
VS = 5V, 0V
RL = 10k
0
–5
–10
CHANGE IN OFFSET VOLTAGE (µV)
INPUT VOLTAGE (µV)
RL = 2k
2
RL = 2k
1
0
RL = 10k
–1
–2
–15
–3
– 20
0
5
–20 –15 –10 – 5
10
OUTPUT VOLTAGE (V)
15
20
–4
1
0
2
4
3
OUTPUT VOLTAGE (V)
5
Total Harmonic Distortion + Noise
vs Peak-to-Peak Voltage
1
THD + NOISE (%)
THD + NOISE (%)
AV = 1
VS = ±1.5V
AV = 1
VS = ±2.5V
AV = –1
VS = ±2.5V
0.001
0.0001
0
1
2
3
4
INPUT VOLTAGE (VP-P)
5
1498/99 G25
10
N8 PACKAGE, VS = ±15V
–30
LT1499CS, VS = ±15V
0
20
40 60 80 100 120 140 160
TIME AFTER POWER-UP (SEC)
1498/99 G24
VS = ±1.5V
VIN = 2VP-P
RL = 10k
0.1
AV = –1
VS = ±1.5V
S8 PACKAGE, VS = ±15V
–20
– 40
6
N8 PACKAGE, VS = ± 2.5V
LT1499CS, VS = ± 2.5V
–10
Total Harmonic Distortion + Noise
vs Frequency
f = 1kHz
RL = 10k
0.01
S8 PACKAGE, VS = ± 2.5V
0
1498/99 G23
1498/99 G22
1
3.5
10
3
10
3.0
2.5
2.0
SETTLING TIME (µs)
1498/99 G21
Open-Loop Gain
4
15
5
1.5
36
1498/99 G20
Open-Loop Gain
20
INPUT VOLTAGE (µV)
INVERTING
4
–6
4
10
VS = ±15V
8
OUTPUT STEP (V)
70
Output Step vs
Settling Time to 0.01%
Slew Rate vs Supply Voltage
Capacitive Load Handling
AV = 1
0.1
AV = –1
0.01
0.001
0.01
0.1
1
10
FREQUENCY (kHz)
100
1498/99 G26
LT1498/LT1499
U W
TYPICAL PERFORMANCE CHARACTERISTICS
5V Small-Signal Response
1V/DIV
5mV/DIV
5V Large-Signal Response
1498/99 G27
VS = 5V
200ns/DIV
AV = 1
VIN = 20mVP-P AT 50kHz
RL = 1k
VS = 5V
AV = 1
VIN = 4VP-P AT 10kHz
RL = 1k
±15V Small-Signal Response
2µs/DIV
1498/99 G28
5V/DIV
5mV/DIV
±15V Large-Signal Response
1498/99 G29
VS = ±15V
AV = 1
VIN = 20VP-P AT 10kHz
RL = 1k
2µs/DIV
1498/99 G30
U
VS = ±15V
200ns/DIV
AV = 1
VIN = 20mVP-P AT 50kHz
RL = 1k
W
U
U
APPLICATIONS INFORMATION
Rail-to-Rail Input and Output
The LT1498/LT1499 are fully functional for an input and
output signal range from the negative supply to the positive supply. Figure 1 shows a simplified schematic of the
amplifier. The input stage consists of two differential
amplifiers, a PNP stage (Q1/Q2) and an NPN stage (Q3/
Q4) which are active over different ranges of input common mode voltage. A complementary common emitter
output stage (Q14/Q15) is employed allowing the output
to swing from rail-to-rail. The devices are fabricated on
Linear Technology’s proprietary complementary bipolar
process to ensure very similar DC and AC characteristics
for the output devices (Q14/Q15).
The PNP differential input pair is active for input common
mode voltages, VCM, between the negative supply to
approximately 1.3V below the positive supply. As VCM
moves further toward the positive supply, the transistor
Q5 will steer the tail current, I1, to the current mirror Q6/
Q7 activating the NPN differential pair, and the PNP
differential pair becomes inactive for the rest of the input
common mode range up to the positive supply.
The output is configured with a pair of complementary
common emitter stages that enables the output to swing
from rail to rail. Capacitors C1 and C2 form local feedback
loops that lower the output impedance at high frequencies.
11
LT1498/LT1499
U
U
W
U
APPLICATIONS INFORMATION
V+
R3
I1
D1
+ IN
Q12
Q11
D5
Q15
C2
Q13
VBIAS
D2
D6
V–
R7
Q4
Q3
Q1
Q10
Q9
Q8
D4
Q7
CC
OUT
Q2
D3
V
R5
R6
Q5
– IN
R4
BUFFER
AND
OUTPUT BIAS
C1
Q6
–
R1
R2
Q14
1498/99 F01
Figure 1. LT1498 Simplified Schematic Diagram
Input Offset Voltage
The offset voltage changes depending upon which input
stage is active. The input offsets are random, but are
trimmed to less than 475µV. To maintain the precision
characteristics of the amplifier, the change of VOS over the
entire input common mode range (CMRR) is guaranteed
to be less than 425µV on a single 5V supply.
Input Bias Current
The input bias current polarity also depends on the input
common mode voltage, as described in the previous
section. When the PNP differential pair is active, the input
bias currents flow out of the input pins; they flow in
opposite direction when the NPN input stage is active. The
offset error due to input bias current can be minimized by
equalizing the noninverting and inverting input source
impedances. This will reduce the error since the input
offset currents are much less than the input bias currents.
Overdrive Protection
To prevent the output from reversing polarity when the
input voltage exceeds the power supplies, two pair of
crossing diodes D1 to D4 are employed. When the input
12
voltage exceeds either power supply by approximately
700mV, D1/D2 or D3/D4 will turn on, forcing the output to
the proper polarity. For the phase reversal protection to
work properly, the input current must be less than 5mA. If
the amplifier is to be severely overdriven, an external
resistor should be used to limit the overdrive current.
Furthermore, the LT1498/LT1499’s input stages are protected by a pair of back-to-back diodes, D5/D6. When a
differential voltage of more than 0.7V is applied to the
inputs, these diodes will turn on, preventing the Zener
breakdown of the input transistors. The current in D5/D6
should be limited to less than 10mA. Internal resistors R6
and R7 (700Ω total) limit the input current for differential
input signals of 7V or less. For larger input levels, a
resistor in series with either or both inputs should be
used to limit the current. Worst-case differential input
voltage usually occurs when the output is shorted to
ground. In addition, the amplifier is protected against
ESD strikes up to 3kV on all pins.
Capacitive Load
The LT1498/LT1499 are designed for ease of use. The
amplifier can drive a capacitive load of more than 10nF
LT1498/LT1499
U
U
W
U
APPLICATIONS INFORMATION
without oscillation at unity gain. When driving a heavy
capacitive load, the bandwidth is reduced to maintain
stability. Figures 2a and 2b illustrate the stability of the
device for small-signal and large-signal conditions with
capacitive loads. Both the small-signal and large-signal
transient response with a 10nF capacitive load are well
behaved.
CL = 0pF
CL = 500pF
CL = 10nF
Feedback Components
To minimize the loading effect of feedback, it is possible to
use the high value feedback resistors to set the gain.
However, care must be taken to insure that the pole formed
by the feedback resistors and the total input capacitance at
the inverting input does not degrade the stability of the
amplifier. For instance, the LT1498/LT1499 in a noninverting gain of 2, set with two 30k resistors, will probably
oscillate with 10pF total input capacitance (5pF input
capacitance + 5pF board capacitance). The amplifier has a
2.5MHz crossing frequency and a 60° phase margin at 6dB
of gain. The feedback resistors and the total input capacitance create a pole at 1.06MHz that induces 67° of phase
shift at 2.5MHz! The solution is simple, either lower the
value of the resistors or add a feedback capacitor of 10pF
of more.
1498/99 F02a
VS = 5V
AV = 1
Figure 2a. LT1498 Small-Signal Response
CL = 0pF
CL = 500pF
CL = 10nF
1498/99 F02b
VS = 5V
AV = 1
Figure 2b. LT1498 Large-Signal Response
U
TYPICAL APPLICATIONS N
1A Voltage Controlled Current Source
1A Voltage Controlled Current Sink
V+
0.5Ω
V+
V+
1k
1k
VIN
1k
VIN
Si9410DY
–
100Ω
1/2 LT1498
RL
100Ω
1/2 LT1498
500pF
–
IOUT
+
500pF
Si9430DY
+
1k
V + – VIN
0.5Ω
tr < 1µs
IOUT =
IOUT
RL
1498/99 TA03
VIN
0.5Ω
tr < 1µs
IOUT =
0.5Ω
1498/99 TA04
13
LT1498/LT1499
U
TYPICAL APPLICATIONS N
Input Bias Current Cancellation
RG
RF
SIGNAL
AMP
–
VOUT
1/2 LT1498
+
VIN
1M
+
1/2 LT1498
CANCELLATION
AMP
–
22pF
1M
1498/99 TA05
INPUT BIAS CURRENT LESS THAN 50nA
FOR 500mV ≤ VIN ≤ (V + – 500mV)
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.025
0.325 –0.015
8.255
+0.635
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
14
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.015
(0.380)
MIN
N8 0695
LT1498/LT1499
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
8
5
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
3
2
4
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 0996
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
14
13
12
11
10
9
8
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
2
3
4
5
6
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0° – 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
7
0.050
(1.270)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
S14 0695
15
LT1498/LT1499
U
TYPICAL APPLICATION
Bidirectional Current Sensor
voltage is then amplified at the Charge Out by the ratio of
RB over RA. In this mode, the output of A2 remains high,
keeping Q2 off and the Discharge Out low, even though the
(+) input of A2 exceeds the positive power supply. During
the discharge cycle, A2 and Q2 are active and the operation
is similar to the charge cycle.
A bidirectional current sensor for battery-powered systems is shown in Figure 3. Two outputs are provided: one
proportional to charge current, the other proportional to
discharge current. The circuit takes advantage of the
LT1498’s rail-to-rail input range and its output phase
reversal protection. During the charge cycle, the op amp
A1 forces a voltage equal to (IL)(RSENSE) across RA. This
IL
CHARGE
VBATTERY
+
A2
1/2 LT1498
–
RSENSE
0.1Ω
VBATTERY
DISCHARGE
RA
RA
RA
Q2
MTP23P06
DISCHARGE
OUT
+
A1
1/2 LT1498
RA
–
Q1
MTP23P06
CHARGE
OUT
RB
RB
()
RB
R
RA SENSE
FOR RA = 1k, RB = 10k
VO
= 1V/A
1498/99 F03
IL
VO = IL
Figure 3. Bidirectional Current Sensor
RELATED PARTS
PART NUMBER
DESCRIPTON
COMMENTS
LTC 1152
Rail-to-Rail Input and Output, Zero-Drift Op Amp
High DC Accuracy, 10µV VOS(MAX), 100nV/°C Drift, 1MHz GBW,
1V/µs Slew Rate, Max Supply Current 2.2mA
LT1211/LT1212
Dual/Quad 14MHz, 7V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 1.8mA per Op Amp
LT1213/LT1214
Dual/Quad 28MHz, 12V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 3.5mA per Op Amp
LT1215/LT1216
Dual/Quad 23MHz, 50V/µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 450µV VOS(MAX),
Max Supply Current 6.6mA per Op Amp
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475µV VOS(MAX), 400kHz GBW, 0.13V/µs Slew Rate,
Max Supply Current 520µA per Op Amp
LT1490/LT1491
Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps
Max Supply Current 50µA per Op Amp, 200kHz GBW, 0.07V/µs
Slew Rate, Operates with Inputs 44V Above V – Independent
of V +
®
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900
FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com
14989f LT/TP 0397 7K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1996